Transform Boulder to Pebble

You transform one natural boulder you can see into a pebble no more than 1 inch in diameter. The boulder can be no more than 1,000 cubic feet (a cube 10 feet on a side, or a sphere 12 feet in diameter). The boulder remains in pebble form until the magic is dispelled. The spell has no effect on creatures of living stone or on man-made objects; the target must be a boulder in its natural state.

At Higher Levels. For each spell slot used higher than 4th level, you can affect an additional boulder.